<template>
  <view>
    <my-search :bgcolor="'skyblue'" :radius="10" @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
        <!-- 左侧的滑动区域 -->
        <scroll-view class="left-scroll-view" :style="{height: wh+'px'}" scroll-y="true" >
          <block v-for="(item,i) in cateList" :key="i">
            <view :class="['left-scroll-view-item', active===i? 'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
          </block>
        </scroll-view>
        <!-- 右侧的滑动区域 -->
        <scroll-view :scroll-top="scrollTop" scroll-y="true" :style="{height:wh + 'px'}">
            <view class="cat-lv2" v-for="(item2,i) in cateLevel2" :key="i">
              <!-- 二级分类的标题 -->
              <view class="cate-lv2-title">
                /{{item2.cat_name}}/
              </view>
              <!-- 三级分类的标题 -->
              <view class="cate-lv3">
                <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                  <image :src="item3.cat_icon" mode=""></image>
                  <text>{{item3.cat_name}}</text>
                </view>
              </view>
            </view>
        </scroll-view>
      </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'

  export default {
    mixins:[badgeMix],
    data() {
      return {
        wh:null,
        cateList:[],
        active:0,
        cateLevel2:[],
        scrollTop:0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods:{
      async getCateList(){
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!==200) return uni.$showMsg()
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
        console.log(res)
      },
      activeChanged(i){
        this.active = i
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop = this.scrollTop===0 ? 1:0
      },
      gotoGoodsList(item3) {
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item3.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
    .left-scroll-view {
      width: 120px;
      .left-scroll-view-item {
        position: relative;
        line-height: 60px;
        text-align: center;
        background: #F7F7F7;
        font-size: 12px;
        &.active {
          background-color: white;
          &::before {
            content: '';
            position: absolute;
            display: block;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 30px;
            background: #c00000;
          }
        }
      }
    }
  }
  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3{
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item{
      margin-bottom: 10px;
      width: 33.3%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
    }
  }
</style>
